CN1265057C - Molded pulp product, and method and apparatus for production thereof - Google Patents
Molded pulp product, and method and apparatus for production thereof Download PDFInfo
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- CN1265057C CN1265057C CN 02803918 CN02803918A CN1265057C CN 1265057 C CN1265057 C CN 1265057C CN 02803918 CN02803918 CN 02803918 CN 02803918 A CN02803918 A CN 02803918A CN 1265057 C CN1265057 C CN 1265057C
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J3/00—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds
- D21J3/10—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds of hollow bodies
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J7/00—Manufacture of hollow articles from fibre suspensions or papier-mâché by deposition of fibres in or on a wire-net mould
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Abstract
A pulp molded article having a pulp fiber layer (2) of single layer structure which is formed by papermaking from a single raw material composition and has a density distribution in the thickness direction thereof The pulp fiber layer (2) has such a density distribution that the density increases or decreases in the thickness direction thereof.
Description
Technical field
The present invention relates to the manufacturing method and apparatus of molded pulp product, molded pulp product, particularly thin, light and good mold forming body, its manufacture method and the manufacturing installation of heat-proof quality.
Background technology
As the prior art relevant with the heat-insulated container of pulp mold, such as, the known technology that the flat 11-301753 communique record of TOHKEMY is arranged.
This technology relates to the double container of the thermal insulation that is formed by container body and the outer layer container that is provided with specified gap in its outside.
Such heat-insulated container must have outer layer container in the arranged outside of container body, so that heat insulation.Therefore, the thickness of integral container increases.In addition, because container is a dual structure, so alleviating also of container weight is restricted.
Summary of the invention
The invention provides thin, light and the good novel molded pulp product of heat-proof quality, and the manufacturing method and apparatus that is used for making effectively this pulp mold spare.
Paper pulp model forming spare of the present invention has the layer of pulp fibres of single layer structure, and the layer of pulp fibres of this single layer structure adopts single slurries to copy slurry and handles and form, and along thickness direction, has Density Distribution.
The present invention relates to a kind of manufacture method of molded pulp product, this method comprises: to the layer of pulp fibres that constitutes by single slurries copy that slurry is handled, processed copy the slurry dehydration procedure; And this paper pulp fiber that will dewater is placed in the drying mould, makes along the thickness direction of layer of pulp fibres and carries out Density Distribution, carries out dry drying process simultaneously.Specifically, inner face at above-mentioned drying mould, part corresponding to the layer of pulp fibres that does not have Density Distribution, form steam vent with external communications, by above-mentioned steam vent, forced exhaust is carried out in above-mentioned drying mould inside, core by elastically deformable simultaneously, from being arranged at the inside of the layer of pulp fibres in the drying mould, this layer of pulp fibres after the above-mentioned inner face of above-mentioned drying mould is pushed, is reduced the pressing force of core, stop above-mentioned exhaust, above-mentioned core is separated with above-mentioned layer of pulp fibres, carry out Density Distribution along the thickness direction of this layer of pulp fibres.
In addition, the present invention relates to be used for the manufacturing installation of manufacture method of the molded pulp product of the invention described above.Specifically, the manufacturing installation of molded pulp product of the present invention comprises: be provided with the drying mould of layer of pulp fibres and the core of the taken place strain of the inner face of this drying mould of paper pulp fiber course being pushed from the inside that is disposed at the layer of pulp fibres in this drying mould, and, above-mentioned inner face at above-mentioned drying mould, corresponding to the part of the above-mentioned layer of pulp fibres that does not have Density Distribution, form steam vent with external communications.
Description of drawings
Fig. 1 is the half section figure as the molded pulp product of the present invention of heat-insulated container.
Fig. 2 is one of the manufacturing installation of representing molded pulp product of the present invention in a schematic way
The figure of embodiment.
Fig. 3 (a)～(d) is the figure of the drying process of the layer of pulp fibres that forms the container body in the above-mentioned heat-insulated container of expression in a schematic way, Fig. 3 (a) expression will be copied the state that layer of pulp fibres behind the slurry is arranged at the inside of drying mould, Fig. 3 (b) is illustrated in the chamber of drying mould, push the state of layer of pulp fibres by core, the state that Fig. 3 (c) expression is shunk core, Fig. 3 (d) represents the container body of the demoulding.
Fig. 4 (a) and Fig. 4 (b) represent the tectal formation operation in the above-mentioned heat-insulated container in a schematic way, Fig. 4 (a) expression is by vacuum forming, at the state of the stacked resin film of inner face of container body, Fig. 4 (b) is the enlarged drawing of major part of the lamination of resin film.
The specific embodiment
With reference to the accompanying drawings, according to preferred embodiment, the present invention will be described.
Fig. 1 represents to be used for the embodiment of molded pulp product of the present invention of heat-insulated container type of the food containers of convenient cup face etc.In the figure, label 1 expression heat-insulated container, label 23 is represented the graticule of pouring into of hot water, folded the putting down of label 24 expressions used stage portion.
As shown in Figure 1, in heat-insulated container 1,, form the container body 20 of cup-shaped by layer of pulp fibres 2.In the opening edge portion of this container, be formed with the flange part 21 of specific thickness, the inner face of container body 20 (layer of pulp fibres 2) and flange part 21 are covered by cover layer 3.
Layer of pulp fibres 2 is a single layer structure, its single slurries (feedstock composition) that adopt the back to illustrate are copied slurry and are handled, and on the barrel 22 of container body 20, the density that has layer of pulp fibres 2 along thickness direction from the inboard toward the outer side is from the big Density Distribution of little change.
In this manual, layer of pulp fibres has the size (pore volume: empty volume) distribute along thickness direction that Density Distribution refers to space between the paper pulp fiber of combination in layer of pulp fibres.The space is big more, and the density of layer of pulp fibres is more little, and the space is more little, and the density of layer of pulp fibres is big more.Therefore, if the size in the space between this fiber is certain along thickness direction, then this layer of pulp fibres does not have above-mentioned Density Distribution.
From obtaining higher intensity, the density in the preferred layer of pulp fibres 2 changes continuously, and from obtaining higher thermal insulation, preferred above-mentioned density is step-like and discontinuous variation.
If consider the weight saving of vessel strength, thermal insulation, container, the thickness of barrel 22 that then has above-mentioned Density Distribution is preferably in the scope of 0.5～3.0mm, more preferably in the scope of 0.5～2.0mm.If the not enough 0.5mm of this thickness then can't obtain the necessary intensity of container, the thermal insulation used as the cup face, if above-mentioned thickness surpasses 3.0mm, then the container used of cup face is overweight.
Bulk density (dried bulk density) with barrel 22 of above-mentioned Density Distribution is preferably at 0.1～0.6g/cm
3Scope in, more preferably at 0.2～0.5g/cm
3Scope in.If the not enough 0.1g/cm of above-mentioned density
3, then can't obtain as the necessary intensity of cup surface vessel, if above-mentioned density surpasses 0.6g/cm
3, then thermal insulation is insufficient, is difficult to hold container filled with hot water by handing merely.In addition, form when having the bottom of Density Distribution, the density of bottom is preferably the bulk density identical with barrel.
Preferred 0.2～the 0.9g/cm of bulk density (dried bulk density) of the part beyond the above-mentioned barrel 22
3, particularly, the density at position that necessarily requires intensity is preferably at 0.3～0.9g/cm
3Scope in.
Above-mentioned layer of pulp fibres 2 is preferably formed by paper pulp fiber.As paper pulp fiber, exemplify the non-wood pulp of the wood pulp, cotton paper slurry, cotton linter paper pulp, bamboo, straw etc. of former raw pulp, old paper paper pulp etc., or by these paper pulp are carried out basification, or crosslinking Treatment and form have a hydrophobic paper pulp fiber.Particularly, have " HBA-LA ", " HBA-S " that hydrophobic paper pulp fiber preferably adopts U.S. Weyerhauser company to produce, " HBA-FF " etc.Also two or more these paper pulp fibers can be used to be fit to mixed.
Layer of pulp fibres 2 more preferably comprises swelling agent except having above-mentioned paper pulp fiber, so that improve thermal insulation and superficiality.As this swelling agent, anionic surfactant, cationic surfactant, nonionic surfactant, amphoteric surfactant etc. have been exemplified.These swelling agents both can use separately, also can mix use.Particularly, as the swelling agent that improves thermal insulation, " KB-115 ", " KB-08W " that preferably adopt Kao Corp to produce.
In above-mentioned paper pulp fiber 2, not only comprise above-mentioned swelling agent, but also can comprise the additive of pigment, fixative, mould inhibitor, filler etc.
Above-mentioned cover layer 3 makes heat-insulated container 1 have functions such as water proofing property, oil resistivity, gas-insulated property.The thickness of cover layer 3 can be set corresponding to these functions.Cover layer 3 can be by forming resin molding is stacked.
As the resin film that is used for above-mentioned cover layer 3, exemplified such as, the Biodegradable resin film of the thermoplastic resin film of the phenylethylene resin series of the polyethylene-based resin of the polyamide-based resin of the polyester based resin of the polyolefin-based resins of polyethylene, polypropylene etc., polyethylene terephthalate etc., nylon etc., polyvinyl chloride etc., polystyrene etc. etc., modification polyethylene terephthalate, aliphatic polyester etc.If consider manufacturing cost, mouldability etc., preferably adopt polyolefin-based resins, the aspect from the disposability of worry environment preferably adopts the Biodegradable resin film.Cover layer also can form according to the stacked mode more than 2 kinds with these resin films.
Below with reference to Fig. 2, the situation of manufacturing installation that the preferred manufacturing installation of pulp molded body of the present invention is suitable for the container body 20 of heat-insulated container 1 is illustrated.
Fig. 2 represents that the manufacturing installation of pulp molded body of the present invention is suitable for the embodiment of the food of convenient cup face etc. with the manufacturing of heat-insulated container.In the drawings, label 10 expression manufacturing installations.
At the inner face of drying mould 11,, form steam vent 13 with external communications corresponding to the part of the layer of pulp fibres 2 that does not have Density Distribution.
In the present embodiment, barrel 22 corresponding parts in the formation face of the chamber of drying mould 11 and container body 20, the steam vent that does not have steam, in the formation face of above-mentioned chamber and flange part 21 container body 20, the corresponding part in bottom (comprising bottom surface and the part that erects from the bottom surface) offer the steam vent 13 with the steam of external communications.
From surface smoothing, the exhaust efficiency of the formed body that obtained, prevent the viewpoint that the eyelet of steam vent stops up, the shape of above-mentioned each steam vent is preferably slit-shaped.The amplitude of steam vent (width of slit) is preferably in the scope of 0.1～0.5mm, more preferably in the scope of 0.1～0.3mm.In addition, in the present embodiment, from vessel strength, prevent the viewpoint of dirt, the whole aperture area of above-mentioned steam vent is preferably at 100～1500mm
2Scope in, more preferably at 200～1000mm
2In the formed body of manufacturing, have when planning to make the bright part in bight, the equilateral fate of crest line, preferably the part of exposing at edges such as planning to make this bight has steam vent 13.
Above-mentioned core 16 has elasticity, inflatable contraction, and be a bag shape.As the material of core 16, can exemplify tensile strength, recover good urethanes, fluorine such as elasticity and retractility is rubber, silicone-based rubber, or elastomer etc.In core 16, be provided with pipeline 17, this pipeline 17 supplies to the inside of this core 16 with pressure fluid, in pipeline 17, is provided with open and close valve 18.Switchable negative pressure source is connected with the end of pressurized source (not shown) with pipeline 17.
Below according to the manufacture method of heat-insulated container 1, the preferable production process of pulp molded body of the present invention is described.
What the manufacture method of heat-insulated container 1 comprised the layer of pulp fibres 2 that forms container body 20 copies the slurry dehydration procedure, and the layer of pulp fibres 2 of having dewatered is carried out dry drying process, and the formation operation of above-mentioned cover layer 3.
Copying in the slurry dehydration procedure of layer of pulp fibres 2, at first, adopt single slurries, the layer of pulp fibres 2 of single layer structure is copied slurry handle.Copy in the slurry process at this,, use the paper-making mold be formed with the chamber of said vesse main body 2 corresponding regulation shapes by each folding die combination with a pair of folding mould.Above this chamber, be formed with peristome.
In each the folding mould that constitutes paper-making mold, form many communication paths with above-mentioned chamber and external communications.Each communication paths is connected with aspirator (not shown)s such as suction pumps.
From the shortening of water discharge time, the aspect of mouldability, the whole aperture area rate of the communication paths of the inner face of folding mould (chamber formation face) is preferably in 4～20% scope, more preferably in 3～50% scope.
In addition, on the formation face of chamber, be preferably formed with the rhone that is communicated with each communication paths.From the aspect that prevents to copy distortion, mouldability, the drainage of slurry net and prevent to copy the mesh obstruction of slurry net, the whole aperture area rate of the rhone on the formation face of chamber is preferably in 50～90% scope, more preferably in 60～80% scope.In addition, stop up the aspect that prevents from preventing the mesh of copying distortion, mouldability, the drainage of slurry net and copying the slurry net, the width of this rhone is preferably in the scope of 1～10mm, more preferably in the scope of 2～5mm.Preferably, rhone is according to each communication paths ways of connecting is latticed formation.
The slurry net of copying that the inner face of each folding face is prescribed covers.Copying the slurry net can use according to the mode that one or more nets that formed by natural fabric, synthetic fiber or metal fibre are made up.In addition, in above-mentioned material, from the formation easiness of net, the durability aspect preferably adopts synthetic fiber.As above-mentioned natural fabric, string, animal fiber etc. have been exemplified.In addition, as above-mentioned synthetic fiber, exemplify the synthetic resin fiber that forms by thermoplastic resin, thermosetting resin, semi-synthetic resin.In addition, as above-mentioned metal fibre, stainless steel fibre, copper fiber etc. have been exemplified.From the flatness that improves net, the aspect of durability, preferably the fiber surface of copying the slurry net is carried out upgrading and handle.
If passing through of the solid state component in the mouldability of copying slurry of consideration manufacturing, durability, the slurries, prevent aspects such as mesh obstruction, the line footpath of then copying the slurry net is preferred in the scope of 0.05～1.0mm, more preferably in the scope of 0.05～0.5mm, the mesh spacing of this net is preferably in the scope of 0.15～2.0mm, more preferably in the scope of 0.15～1.5mm.
If be injected in the chamber,,, suction process is carried out in the inside in chamber with pressure reducing mode by suction pump by above-mentioned rhone, above-mentioned communication paths with the slurry of pressuring method with ormal weight.Then, remove moisture in the slurries in the suction mode, the formation face that covers the chamber to copy slurry online, form layer of pulp fibres.
From the shortening of slurries injection length, the aspect of mouldability, the injection pressure of the slurries in the chamber are preferably in the scope of 0.05～1.0MPa, more preferably in the scope of 0.05～0.5MPa.
From the shortening of dewatering time, the aspect of mouldability, by the air pressure in the chamber of communication paths of decompression preferably in the scope of 10～90kPa, more preferably in the scope of 20～70kPa.
The single slurries of copying the slurry processing that are used for layer of pulp fibres 2 preferably adopt the type that is only formed by layer of pulp fibres and water.
As paper pulp fiber, exemplify former raw pulp, old paper paper pulp etc. wood pulp, cotton paper slurry, cotton linter paper pulp, bamboo, straw etc. non-wood pulp or by these paper pulp being carried out basification, or crosslinking Treatment and form have a hydrophobic paper pulp fiber.Particularly, have " HBA-LA ", " HBA-S " that hydrophobic paper pulp fiber preferably adopts U.S. Weyerhauser company to produce, " HBA-FF " etc.Also can use these paper pulp fibers in the mode that is fit to mixed according to two or more.
The content of the paper pulp fiber in these slurries is preferably in the scope of 0.05～10wt%, more preferably in the scope of 0.05～4wt%.
In the single slurries of copying slurry usefulness of layer of pulp fibres 2, according to suitable ratio, add above-mentioned swelling agent, filler, pigment, fixative, mould inhibitor, etc. additive.
After being injected into the slurries of ormal weight in the chamber with pressuring method, by above-mentioned communication paths, reduce the pressure in the chamber continuously, and pressure fluid is supplied to the inside in chamber, it is copied slurry handle, formed layer of pulp fibres 2 is carried out processed.
The pressure fluid that is used to dewater adopts air, steam, superheated steam etc.
From the aspect of dewatering efficiency, the pressure of the pressure fluid during dehydration is in the scope of 0.05～1.0MPa, more preferably in the scope of 0.05～0.5MPa.
From the surface smoothing and the thermal insulation of drying efficiency, dried container, prevent the viewpoint that dried vessel surface burns, the moisture content of the layer of pulp fibres 2 after the dehydration is preferably in 50～85% scope, more preferably in 60～80% scope.
Layer of pulp fibres 2 is being carried out processed behind the moisture content of regulation, it is spaced apart to make layer of pulp fibres 2 and chamber form face.Then, the layer of pulp fibres 2 of drying regime is not transferred to the inside of above-mentioned drying mould 11.
As present embodiment, when having the container body 20 of flange part 21, with the chamber formation face of the barrel 22 corresponding drying moulds 11 of container body 20 on, do not offer the steam vent of steam, on the flange part 21 of container body 20, bottom (comprising bottom surface and the part that erects from this bottom surface) corresponding chamber formation face, offer steam vent 13 with the steam of external communications.As shown in Fig. 3 (b), layer of pulp fibres 2 is arranged on the inside of drying mould 11, the top peristome 111 of drying mould 11 is had lid 15 sealings of through hole 14, by heater 120, drying mould 11 is heated to set point of temperature then.
From preventing the viewpoint of burning and improve drying efficiency of layer of pulp fibres 2, the temperature of drying mould 11 (mold temperature) is preferably in 150～300 ℃ scope, more preferably in 170～250 ℃ scope.
In drying mould, layer of pulp fibres is heated, on the other hand, shown in Fig. 3 (b) like that, by the above-mentioned through hole 14 of above-mentioned lid 15, above-mentioned core 16 is inserted the inside in the chamber 110 of drying moulds 11, with chamber 110 sealings.Then, pressure fluid is supplied with the inside of core 16, core 16 110 inside is expanded in the chamber, thus, layer of pulp fibres 2 is pressed on the formation face of chamber, it is heated drying.
From the viewpoint of thermal insulation, drying efficiency, surface smoothing, the pressing force of the core 16 during heat drying is preferably in the scope of 0.05～1.0MPa, more preferably in the scope of 0.1～0.3MPa.
When above-mentioned heat drying,, the steam that produces from layer of pulp fibres 2 is carried out forced exhaust by above-mentioned steam vent 13.Thus, with the position of the corresponding layer of pulp fibres 2 of the part that does not form steam vent, residued in moisture between the fiber before arriving steam vent, part gasification enlarges the space between the fiber, thus, layer of pulp fibres 2 is lower in the density of inboard.On the other hand since the peristome that is formed with container body 20 and with the part of the corresponding steam vent 13 in bottom, realize that the moisture of gasification is discharged from steam vent at once, compress constantly by pressing force by core, the density of layer of pulp fibres 2 constantly increases.
From the expanded aspect of drying efficiency, container, the pressure of above-mentioned forced exhaust is preferably in the scope of 4～60kPa, more preferably in the scope of 4～10kPa.
If layer of pulp fibres 2 is dry fully, then as shown in Fig. 3 (c), the inside removal pressure fluid from core 16 dwindles core 16, reduces the internal pressure in chamber 110, on the other hand, stop the forced exhaust by steam vent 13.
When carrying out above-mentioned forced exhaust, can be as required, carry out the operation of pressurizeing repeatedly by 16 pairs of layer of pulp fibres 2 of core, and stop the operation that forced exhaust shrinks core 16.
Then, make the barrel 22 of container body 20 have enough Density Distribution, then,, open folding mould 12,12, take out container body 20, as required, container body is repaired processing as shown in Fig. 3 (d).
In the formation operation of above-mentioned cover layer 3, by above-mentioned cover layer 3, the inner face and the flange part 21 of covering container main body 20 (layer of pulp fibres 2).
By above-mentioned resin film, when forming cover layer 3, can adopt the known method of pressing empty moulding, vacuum forming etc.
When adopting the vacuum forming mode, such as, as Fig. 4 (a) and (b), can adopt connector 6 with vacuum forming mold 5 and heater 60, form cover layer.The size of vacuum forming mold 5 drying type that drying process adopted 10 with above-mentioned layer of pulp fibres 2 basically is identical, forms on the face 50 in this chamber, has latticed air channel 51, and has from air channel 51, with the vacuum draw path 52 of external communications.Then,, container body 20 is set, in addition,, will heats in advance and softening resin film 30 is arranged on above-mentioned peristome according to the mode that the peristome of container body 20 is stopped up in the inside of this vacuum forming mold 5.Then, from the top, connector 6 is contacted with resin film 30, resin film 30 is pressed into the inside of container body 20, on the other hand, utilizes the aeration of container body 20, by air channel 51 and vacuum draw path 52, reduce the pressure inside of container body 20,, paste and pay resin film 30 according to the mode that inner face and flange part 21 with container body 20 cover.In addition, remove unnecessary resin film 30, the manufacturing of heat-insulated container 1 finishes.
Like this, container body 20 is formed by the layer of pulp fibres 2 of following single layer structure, it is in barrel 22, have from the inboard toward the outer side density from the big Density Distribution of little change along thickness direction, thus, thinner thickness, weight is lighter, thermal insulation is good, can obtain required intensity in the outside of container body.In addition, owing to be not used to reduce the blowing agent of density, so pass through the mode at the material of layer of pulp fibres and cover layer employing biological degradability, acquisition and protection environment be good heat-insulated container accordingly.In addition, barrel 22 and bottom do not have seam, flange part 21, and barrel 22 and bottom are integrally formed, and mechanical strength (compressive strength, patience) is also good.In addition, because the outer surface of layer of pulp fibres 2 also is highdensity, surface smoothing is so printing characteristic is also good.
Handle the layer of pulp fibres 2 that forms by only 1 time the slurry of copying that adopts single slurries, form container body 20, so compare with method in the past, the manufacturing process of heat-insulated container 1 simplifies, and shortens.So the production efficiency of heat-insulated container 1 improves significantly than method in the past.
The invention is not restricted to the heat-insulated container 1 of the foregoing description, can in the scope that does not break away from essence of the present invention, suitably change.
At molded pulp product of the present invention is under the situation of the such heat-insulated container of previous embodiment 1, preferably, in the barrel of container body, has the above-mentioned Density Distribution of layer of pulp fibres, but, have purposes that the position of above-mentioned Density Distribution can corresponding molded pulp product, shape etc. and set.
In addition, necessarily require under the situation of thermal insulation, also can make the integral body of layer of pulp fibres have above-mentioned Density Distribution at the integral container of bowl-shape greatly, plate-like etc.
Molded pulp product of the present invention preferably as the heat-insulated container 1 of the foregoing description, comprises along thickness direction, has from the inboard toward the outer side, and density is from the pulp layer of the single layer structure of the big Density Distribution of little change.On the other hand, be that the container of main purpose, the industrial parts etc. with sound absorption function also can comprise along thickness direction having from the inboard toward the outer side with the protection contents, density is from the pulp layer of the single layer structure of the Density Distribution that diminishes greatly.
In molded pulp product of the present invention, preferably as previous embodiment, flange part 21 is starched when handling copying of layer of pulp fibres 2 and is formed, but also can by bending machining, form flange part after copying of layer of pulp fibres starched processing.In addition, the form of flange part is not limited to toward the outer side, and the curvature form of curling according to the rules also can be other form.
In molded pulp product of the present invention, preferably as previous embodiment,, form cover layer 3 by resin film, still, also can pass through applying coatings, form cover layer.As the coating method of coating, exemplify this coating of coating, container body 20 be soaked in the mode such as interior of this coating.
In addition, in molded pulp product of the present invention, because its outside is by above highdensity other layer of pulp fibres covering of the density of above-mentioned fibrage 2, so can further improve printing adaptability, intensity, resistance to water etc.
In molded pulp product of the present invention,, adopt by one group of folding die combination being formed the paper-making mold in the chamber of regulation preferably as previous embodiment, layer of pulp fibres is copied slurry to be handled, but, needn't adopt the folding mould according to the shape of the molded pulp product of manufacturing.In addition, also can adopt other the paste-making method of copying.Such as, also following punch can be soaked in the above-mentioned slurries, this punch is copied the slurry net and is formed by copying slurry portion and covering this regulation of copying slurry portion, this is copied slurry portion and has with the corresponding convex form of the profile of container body and have a plurality of fluid circulating holes at its outer surface opening, by above-mentioned fluid circulating hole, attract above-mentioned slurries, layer of pulp fibres is copied to starch in above-mentioned copy on the slurry net surface, form layer of pulp fibres, the material of punch both can be rigid body; Also can be elastomer.
In addition, in molded pulp product of the present invention, equally when layer of pulp fibres 2 complex-shaped, from pushing the aspect of this layer of pulp fibres equably, the preferred core that adopts hollow carries out heat drying to layer of pulp fibres 2, still, when the heat drying of layer of pulp fibres 2, also can adopt the core of entity.
Molded pulp product of the present invention also can form by following manner, this mode is: can with the die of the corresponding shape of profile through copying the layer of pulp fibres that slurry handles in, this layer of pulp fibres is set, then, to keep certain interval with this die, carried out the punch and the die combination of heating, made this layer of pulp fibres drying.
In addition, molded pulp product of the present invention also can form by following manner, this mode is: in advance in die inside, the profiled member (another layer of pulp fibres) of the high density paper pulp of drying is set, make the profiled member and the layer of pulp fibres of paper pulp form one, then, will keep a determining deviation with die through copying the moisture state that slurry handles, through the punch and the die combination of heating, said composition is carried out drying.By adopting such drying means, by the steam that produces from the layer of pulp fibres of moisture state, enlarge the layer of pulp fibres of moisture state dry simultaneously, thus, obtain following molded pulp product, wherein, the outside is covered by highdensity layer of pulp fibres, have outside-in, density is from the big Density Distribution of little change.The printing adaptability of this profiled member, intensity, resistance to water are very good, and inboard superficiality is also good.In addition, independent layer of pulp fibres of the present invention can adopt the fiber of the manufacturing that is used for above-mentioned layer of pulp fibres 2, forms by the common paste-making method of copying.
Molded pulp product of the present invention is as above-mentioned embodiment, be particularly suitable for having the heat-insulated container of flange part, but the suitable object of profiled member of the present invention is not limited thereto, and also can be suitable for the hollow molding spare, flat profiled member etc. of container, tubular profiled member etc. of different shape of the container, disc shaped container etc. of big bowl-shape container, ampuliform.
Below by embodiment, the present invention is further specified.
According to the explanation of the 1st embodiment and the 1st comparative example, make heat-insulated container, carry out the various performance evaluations of this container.The result who estimates provides in table 1.
(the 1st embodiment)
＜container body size shape)
Height H: 106mm
Peristome internal diameter φ 1:90mm
Base profile φ 2:68.5mm
Flange part maximum outside diameter φ 3:96mm
Flange part thickness T: 3mm
Barrel thickness T 22:1.4mm
Bottom thickness T25:1.2mm
Adopt following paper-making mold, under the following conditions, layer of pulp fibres is copied slurry handle, this paper-making mold has the one group of folding mould that is formed with the corresponding chamber of container body of above-mentioned size shape.
＜paper-making mold 〉
Material: aluminium
The whole aperture area of communication paths: 1287mm
2(with barrel, the corresponding part in bottom: φ 3mm * 54=382mm
2, and the corresponding part of flange part periphery: slit-shaped, width are 3mm, full week=905mm
2)
The whole aperture area of rhone (latticed): 25071mm
2
Rhone width: 3mm
The chamber forms the whole aperture area rate of the rhone of face: 75%
Copy the slurry net: the dual slurry net of copying that forms by the PET system net of the PET system net of 20 meshes and 80 meshes
＜slurries are formed 〉
Pulp density: 0.1 weight %
Paper pulp fiber: the paper pulp of crosslinkedization (" HBA-LF " that U.S. Weyerhauser company produces) 50 weight %+ bleached kraft pulps (BKP), 50 weight %
Swelling agent: flower king (Co., Ltd.) produces (KB115) (to paper pulp fiber weight ratio 5%)
Filler: Japanese PMC company produces (AS262) (to paper pulp fiber weight ratio 2%)
＜copy the slurry condition 〉
Slurries quantity delivered: 15 liters (only 1 time)
Slurries supply pressure: 0.2MPa
The swabbing pressure in chamber: 0.06MPa
Under the following conditions, pressure fluid being supplied in the chamber, carry out processed, is 75% until moisture content.
＜dehydration conditions 〉
Pressure fluid: compressed air
Pressing force: 0.2MPa (15 seconds)
The swabbing pressure in chamber: 0.06MPa
Prepare and the corresponding part in the chamber portion periphery of the container body of manufacturing and bottom (bottom surface and erect part from the bottom surface), drying mould with following steam vent, inside at this drying mould, layer of pulp fibres is set, by this steam vent, carry out forced exhaust, simultaneously, in following core, this layer of pulp fibres is exerted pressure.Then, end forced exhaust, core is shunk, make container body.
＜drying mould 〉
Material: aluminium
The slit width of each steam vent: 0.15mm
With the corresponding part of flange part: in the flange part periphery, longitudinally 4 (wherein 1 with the corresponding part opening in the bight of outer peripheral face that is formed at flange part and bottom surface) are set with the spacing of 3mm
With the corresponding part in bottom: in the bottom surface, according to the spacing of 5mm 4 (one is the folding mould) are set, in the whole zone that is erecting part from the bottom surface, longitudinally the spacing according to 3mm is provided with 5
The chamber forms the whole aperture area of the steam vent of face: 396mm
2
The chamber forms the whole aperture area rate of whole steam vents of face: 1.2%
＜core 〉
Material: silicon is rubber
Pressure fluid: compressed air
＜drying condition 〉
Mold temperature: 200 ℃
Core pressing force: 0.2MPa (15 seconds)
Forced exhaust pressure: 5kPa
＜tectal formation 〉
On acquired container body, form cover layer under the following conditions, make heat-insulated container.
Resin film: polyethylene (LDPE/HDPE double-decker)
Resin film thickness: 150 μ m
Vacuum forming machine: three and industrial production trade name PLAVAC-FE36PHS
Film mode of heating: infrared heater (spacing of heater and resin film is 110mm)
Film heating-up temperature: 255 ℃ (make-up machine displays temperature)
Film heat time heating time: 35 seconds
Plug size: diameter 60mm * length 127mm
Connector material: aluminium (handle by special teflon (registration mark) on the surface)
Connector temperature: 110 ℃ (connector real surface temperature)
Vacuum forming mould: oral area aperture φ 89.8mm, base diameter φ 68.5mm, height 93.5mm
Vacuum forming mold temperature: 100 ℃ (the inboard real surface temperature of mould)
Molding time: 8 seconds
(the 1st compared proportions)
Except adopting also in the corresponding part of the barrel of container body, form beyond the drying mould of steam vent (width is 0.15mm, and in the basic full week of barrel, longitudinal pitch is 10mm), according to the mode identical, make heat-insulated container with the 1st embodiment.
(density evaluation)
Cut out acquired container body, according to apparent volume and weight, bulk density.
(evaluation of Density Distribution)
Adopt electrolysis radial pattern scanning electronic microscope (Hitachi, Ltd produces " S-4000 type "),, observe each position of acquired container, judge having or not of Density Distribution according to 50 times multiplying power.
(weight evaluation)
Under 105 ℃ temperature, dried weight to acquired drying containers 1 hour, is measured in indoor at low humidity.
(insulative properties evaluation)
Thermocouple is pasted the outside of paying in the barrel of acquired container,, measure from the temperature in the barrel outside of the container of injection after 3 minutes with the inside of 80 ℃ hot water injection containers.Whether check in addition, can be by the hand-held container that has injected hot water of holding.
＜temperature measuring by thermocouple 〉
Zero: 60 ℃ of less thaies
△：60～65℃
*: above 65 ℃
＜adopt hand-held held container to test 〉
Zero: feel warm degree
△: though sensible heat slightly, the degree that can hold
*: feel heat, the degree that can not hold
(intensity evaluation)
Adopt compression tester (Orientec company produces, tensilon, " RTA-500 "),, the vertical compressive strength and the transverse compression intensity of acquired container are estimated according to following method.
＜vertical compressive strength 〉
The peristome of acquired container towards the below, on placement table, is obtained from the top of container bottom the compressive strength of the container cartridge body when with crosshead (crosshead) speed of 20mm/min pressure head being descended with this container placement.
Zero: 25kgf above (during packing, when transporting, necessary intensity when using)
*: not enough 25kgf
＜transverse compression intensity 〉
With the corresponding part of the flange part of container, be formed with on the placement table of the groove of admitting this flange part, along continuous straight runs is shelved acquired container, obtain from the top of container cartridge portion, according to the crosshead speed of 20mm/min, making diameter is the compressive strength of the press head of the round bar of the 10mm container cartridge body when descending.As following,, carry out relative evaluation with the value of the foaming ethene container made of market sale with acquired intensity.
＜estimate
Zero: identical with foaming ethene container, or its above (intensity of being born during packing, when transmitting, when using)
*: below the foaming ethene container
Confirm that as shown in the table 1, the heat-insulated container of the 1st embodiment compares with the heat-insulated container of the 1st comparative example, thickness is less, and weight is lighter, and thermal insulation is good, the container that can sufficiently use as convenient cup face.
Utilize possibility on the industry
It is less to the invention provides thickness, and weight is lighter, and thermal insulation is good, novel molded pulp product, and the manufacturing method and apparatus that can make molded pulp product effectively.
(table 1)
| The 1st embodiment | The 1st comparative example | |
| Layer is formed *1 | 2 layers | 2 layers |
| Density Distribution *2 | Have | Do not have |
| The thickness of each layer (mm) *3 | 1.4/0.03 | 0.6/0.03 |
| Bulk density (g/cm 3) *4 | 0.4/0.25/0.35 | - |
| Insulative properties | ○ | × |
| Strength characteristics | ○ | ○ |
| Adiabatic drying weight (g) *5 | 13 | 13 |
*1 container body+cover layer
*Density Distribution in 2 container bodies (barrel)
*3 container bodies (barrel)/cover layer
*4 flange parts/barrel/bottom
*5105 ℃, 1 hour drying
Claims (13)
1. a molded pulp product is characterized in that, possesses the layer of pulp fibres of single layer structure, and this layer of pulp fibres is handled and to be formed through copying slurry by single slurries, and has from the inboard Density Distribution that density is laterally changed from small to big along thickness direction.
2. molded pulp product according to claim 1 is characterized in that, the inner face at least of described layer of pulp fibres or outside lining cap rock cover.
3. molded pulp product according to claim 1 is characterized in that, another layer of pulp fibres that the outside of described layer of pulp fibres is different from described layer of pulp fibres covers.
4. molded pulp product according to claim 3 is characterized in that the density of described another layer of pulp fibres is greater than the maximal density of described layer of pulp fibres.
5. molded pulp product according to claim 2 is characterized in that, described layer of pulp fibres and described cover layer are formed by the material of biological degradability.
6. molded pulp product according to claim 1 is characterized in that, forms the container body of cup-shaped by described layer of pulp fibres, forms flange part in its edge of opening portion.
7. molded pulp product according to claim 6 is characterized in that, has described Density Distribution in the barrel of described container body.
8. molded pulp product according to claim 6 is characterized in that, the described flange part of described container body and the density of bottom are than the density height of barrel.
9. the manufacture method of a molded pulp product, this method comprises: with single slurries copy slurry handle form layer of pulp fibres and carry out processed copy the slurry dehydration procedure; And this paper pulp fiber that will dewater is placed in the drying mould, makes that having from the inboard Density Distribution ground that density laterally changes from small to big along the thickness direction of this layer of pulp fibres carries out dry drying process, it is characterized in that,
With the inner face of the corresponding described drying mould of part that is not endowed described Density Distribution of described layer of pulp fibres, form the steam vent that directly is communicated with the outside,
By described steam vent, exhaust is carried out in described drying mould inside, simultaneously, core by elastically deformable, after the described inner face that is arranged at the described drying mould of described paper pulp fiber course in this drying mould pushed, the pressing force of this core is reduced, stop exhaust by described steam vent, described core is separated with described layer of pulp fibres, make that the thickness direction in this layer of pulp fibres has described Density Distribution.
10. the manufacture method of molded pulp product according to claim 9, it is characterized in that, carry out repeatedly the described layer of pulp fibres of being undertaken by described core push operation and reduce described core pressing force, stop the operation of exhaust, simultaneously described layer of pulp fibres is carried out drying.
11. the manufacture method of molded pulp product according to claim 9 is characterized in that, comprises by cover layer covering the inner face at least in the described layer of pulp fibres or the operation of outside.
12. the manufacturing installation of a molded pulp product, this device uses in the manufacture method of the described molded pulp product of claim 9, it is characterized in that,
Comprise the drying mould that is provided with layer of pulp fibres; And will be arranged at the interior layer of pulp fibres of this drying mould pushed and can take place strain internally to the inner face of this drying mould core,
Only with the part of the described inner face of the corresponding described drying mould of part that is not endowed Density Distribution of layer of pulp fibres, form the steam vent that directly is communicated with the outside.
13. the manufacture method of a molded pulp product, this method comprises: to the layer of pulp fibres that forms by single slurries copy that slurry is handled, processed copy the slurry dehydration procedure; And this paper pulp fiber that will dewater is placed in the drying mould, makes that having from the inboard Density Distribution ground that density laterally changes from small to big along the thickness direction of this layer of pulp fibres carries out dry drying process, it is characterized in that,
Only with the part of the described inner face of the corresponding described drying mould of part that is not endowed Density Distribution of layer of pulp fibres, form the steam vent that directly is communicated with the outside,
To have hydrophobic paper pulp fiber or comprise and have being configured in the die with the corresponding shape of profile of this layer of pulp fibres of hydrophobic paper pulp fiber and swelling agent through copying layer of pulp fibres that slurry handles, then, to have certain interval and punch and the combination of this die with this die, make this layer of pulp fibres drying through heating.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001235859 | 2001-08-03 | ||
| JP235858/01 | 2001-08-03 | ||
| JP235859/01 | 2001-08-03 | ||
| JP235858/2001 | 2001-08-03 | ||
| JP235859/2001 | 2001-08-03 | ||
| JP2001235858 | 2001-08-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1488021A CN1488021A (en) | 2004-04-07 |
| CN1265057C true CN1265057C (en) | 2006-07-19 |
Family
ID=26619886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02803918 Expired - Fee Related CN1265057C (en) | 2001-08-03 | 2002-07-30 | Molded pulp product, and method and apparatus for production thereof |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1439264B1 (en) |
| CN (1) | CN1265057C (en) |
| WO (1) | WO2003014471A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60233826D1 (en) * | 2002-05-10 | 2009-11-05 | Kao Corp | FORM FOR THE MANUFACTURE OF FIBERGLASS MOLDED PARTS |
| GB2450872B (en) * | 2007-07-07 | 2011-12-21 | St Neots Packaging Ltd | Improvements in or relating to food packaging |
| CN103452008B (en) * | 2013-01-16 | 2016-07-06 | 王高原 | The two-sided paper mould bowl cover without reticulate pattern and manufacture method thereof |
| DE102014114187B4 (en) | 2014-09-30 | 2018-06-21 | Sig Technology Ag | Method and device for producing a fiber molded part and fiber molded part produced thereafter |
| CN107386014B (en) * | 2017-07-06 | 2023-06-20 | 江苏绿森包装有限公司 | Pulp moulding negative angle container and its processing technology |
| CN109518541A (en) * | 2018-11-08 | 2019-03-26 | 上海纳旭实业有限公司 | Preparation method of modified high-molecular fiber and paper fiber composite material and products thereof and application |
| CN109518539A (en) * | 2018-11-08 | 2019-03-26 | 上海纳旭实业有限公司 | Preparation method of modified lignin resin and paper fiber composite material and products thereof and application |
| CN110219210B (en) | 2019-01-31 | 2024-02-27 | 浙江舒康科技有限公司 | Pulp molding production line and processing method |
| CN110216710A (en) | 2019-01-31 | 2019-09-10 | 浙江舒康科技有限公司 | A kind of transfer device and production line applied to paper mould machinery hand |
| WO2022219526A1 (en) * | 2021-04-12 | 2022-10-20 | Stora Enso Oyj | A multilayered moulded product and method for the preparation thereof |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4850003A (en) * | 1971-11-01 | 1973-07-14 | ||
| JPS51139838A (en) * | 1975-05-30 | 1976-12-02 | Dai Showa Giken Kogyo:Kk | A pulp moulded container. |
| JPH11301753A (en) * | 1998-04-22 | 1999-11-02 | Toppan Printing Co Ltd | Paper heat-insulated container |
| JP2000034699A (en) * | 1998-07-13 | 2000-02-02 | Oji Paper Co Ltd | Hot-pressing mold for pulp molded product and production of pulp molded product |
| JP2000192400A (en) * | 1998-12-22 | 2000-07-11 | Oji Packaging Systems Co Ltd | Production of valve mold |
| JP3249792B2 (en) * | 1999-08-04 | 2002-01-21 | 花王株式会社 | Dry mold for pulp mold |
| JP2001055695A (en) * | 1999-08-09 | 2001-02-27 | Kao Corp | Drying mold for molded pulp product |
-
2002
- 2002-07-30 CN CN 02803918 patent/CN1265057C/en not_active Expired - Fee Related
- 2002-07-30 EP EP02755695A patent/EP1439264B1/en not_active Expired - Fee Related
- 2002-07-30 WO PCT/JP2002/007757 patent/WO2003014471A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2003014471A1 (en) | 2003-02-20 |
| EP1439264A4 (en) | 2006-06-21 |
| EP1439264A1 (en) | 2004-07-21 |
| CN1488021A (en) | 2004-04-07 |
| EP1439264B1 (en) | 2011-06-08 |
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